Add "Set missing values to 0" as a checkbox option in the data import dialog

USE CASE: WHAT DO YOU WANT TO DO?

Allow the user to decide to fill in missing values with 0s during import.

STEPS TO REPRODUCE AN ISSUE (OR TRIGGER A NEW FEATURE)

Open a file never opened before or select import.
Check checkbox "Set missing values to 0"

CURRENT BEHAVIOR

Missing values get NaN (except in list format, where some NaN's get the value of their symmetric companion).

EXPECTED BEHAVIOR

There should be a "Set missing values to 0" checkbox in the Data Import Dialog. Checking it should fill in missing values with 0s. Default should be unchecked. Leaving unchecked sets missing values to NaN (except in cases where "Make Symmetric" is checked and row A, column B has a value and row B, column A does not have a value, which would result in row B, column A getting row A, column B's value.

DEVELOPERS ONLY SECTION

SUGGESTED CHANGE (Pseudocode optional)

none

FILES AFFECTED (where the changes will be implemented) - developers only

unknown

LEVEL OF EFFORT - developers only

minor

COMMENTS

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